Stadium: Court 4 Round: 28 Ground: Synthetic outdoor
| ITF Women Iizuka | 2016/09/28 06:20 | Riko Sawayanagi v Mana Ayukawa | 6-2,6-4 |
| ITF Women Hamamatsu | 2018/10/19 03:40 | Susan Bandecchi v Riko Sawayanagi | 5-7,4-6 |
| ITF Women Hamamatsu | 2018/10/18 01:00 | Riko Sawayanagi v Miyabi Inoue | 6-3,4-6,6-3 |
| ITF Women Hamamatsu | 2018/10/17 04:10 | Riko Sawayanagi v Kisa Yoshioka | 6-1,6-1 |
| ITF Women Nanao | 2018/08/29 06:40 | Shiho Akita v Riko Sawayanagi | 6-7,6-1,7-5 |
| ITF Women Tsukuba | 2018/08/21 00:30 | Riko Sawayanagi v Momoko Kobori | 4-6,3-6 |
| ITF Women Toyota Qual | 2018/03/11 03:30 | Riko Sawayanagi v Mayu Iwai | 6-0,1-6,2-6 |
| ITF Women Toyota Qual | 2018/03/10 01:00 | Riko Sawayanagi v Himari Sato | 7-5,6-0 |
| ITF Women Mildura | 2018/03/06 01:05 | Maddison Inglis v Riko Sawayanagi | 6-0,6-2 |
| ITF Women Hamamatsu | 2018/10/19 01:00 | Marina Yudanov v Mana Ayukawa | 5-7,3-6 |
| ITF Women Hamamatsu | 2018/10/18 04:25 | Haruna Arakawa v Mana Ayukawa | 5-7,6-7 |
| ITF Women Hamamatsu | 2018/10/17 01:00 | Mana Ayukawa v Momoko Kobori | 7-6,2-6,6-2 |
| ITF Women Makinohara | 2018/10/13 03:05 | Mana Ayukawa v Junri Namigata | 1-6,6-3,2-6 |
| ITF Women Makinohara | 2018/10/12 03:00 | Mana Ayukawa v Susan Bandecchi | 6-4,3-6,6-3 |
| ITF Women Makinohara | 2018/10/11 00:30 | Mana Ayukawa v Ramu Ueda | 7-5,1-6,6-2 |
| ITF Women Makinohara | 2018/10/10 00:30 | Nagi Hanatani v Mana Ayukawa | 1-6,7-5,4-6 |
| ITF Women Darwin | 2018/09/24 00:30 | Mana Ayukawa v Kyoka Okamura | 4-6,6-3,3-6 |